Disloyalty and Punishment

If Twilight had any complaints about her captivity, it’d be that ponies didn’t have to use the bathroom often enough. She’d been alone for at least seven hours at this point and still nopony came in to use her.

If she had anything else to complain about, it was that she wasn’t even in her own body. The furrier, or featherier nature of gryphons was proving to be really bad as far as comfort went. She constantly found herself having itches she couldn’t scratch.

Oddly enough, those were her only two issues with her imprisonment. If she desperately needed out, Gilda was just outside in her real body, “keeping an eye” on her (napping). The meals didn’t always taste the best, and she would have killed for a pillow, but her weeklong stay as a toilet was proving to be rather luxurious.

In truth, she loved when she was used. It took her a few feedings to realize it, but she wouldn’t have minded staying this way for months if it meant she got to bottom-feed from her friends every time they needed to relieve themselves.

What was odd to Twilight was that two of her friends still hadn’t used her. Fluttershy, she understood, because the pony is so shy and kind that doing such a thing to another living creature wouldn’t feel right at all to her. Rainbow Dash, however, was the only responsible for Gilda being locked down in the first place; turning her into a toilet was her idea. To not use her after arranging all of this was unusual, especially for Rainbow.

Twilight let out a sigh, staring up into the darkness hanging above from the ceiling. All she could do was wait. She’d already tried several samples of scat from four different sources, one of which even technically included herself. Her conclusion thus far was that bodily waste is, indeed, enough to live off of for small periods of time; she estimated from the weight she was losing that one could last four to five weeks with such a diet. However, this research had an unexpected variable in it; at the moment, she was a gryphon, and it would be impossible to test it on a pony while she was, indeed, a gryphon.

In other words? Once she got in her body again, she would have to do this all over again. Another week. More scat.

She wouldn’t have it any other way, either.

Twilight awoke from her sleep to see a familiar yellow face in front of hers. Fortunately, to not blow her cover, she’d forced herself into the habit of not speaking unless it was absolutely necessary; and in those situations that it was, she would attempt to remain in-character. As such, she stared into the green eyes inspecting her every blink.

“Umm… do you maybe w-want to um… be free…?”

Twilight wasn’t surprised the mare would attempt to come to her rescue. She nodded, staring into Fluttershy’s eyes. She’d already reached her conclusion and there was truly no need for her to continue the experiment as she had already seen major flaws in it, one of which being it didn’t even apply to the appropriate species.

A sigh of relief passed Twilight’s lips as Fluttershy moved back and seemed to play with the binds… until Fluttershy couldn’t help but allow a smirk to cross her lips. Then a giggle. Then a laugh. Then what could only be described as crazed, violent cackling.

Then, her cackling stopped. An eerie quiet surrounded Twilight, and she started to struggle, wondering if Fluttershy had succeeded in freeing her. Nope.

“Do you really think I would let you go?”

The voice coming from Fluttershy’s mouth didn’t sound like her own. No, it was her voice; but it wasn’t the Fluttershy she was used to.

“After all those mean things that you said to me? You think I’d be the one to come and save you!? Even I can’t tolerate a worthless meanie like you!”

Definitely not the Fluttershy she was used to.

The enraged mare hovered her plot over Twilight’s face, her tail twitching and lifting slightly.

“I bet you thought that I wasn’t going to do this, that I was too shy or too weak to come and give you the treatment you deserve… well I’ve got news for you!”

The “news” came out as a high-pitched squeak from Fluttershy’s rear end. It took a graceful moment to settle and rush into Twilight’s senses…

...Twilight began to gag and choke forcefully, desperately wanting to get away from Fluttershy’s ass. This wish obviously wasn’t granted as Fluttershy lowered her plot and sat on top of Twilight’s face. Another small pocket of gas escaped, this time muffled by Twilight’s beak.

The scent was far more dreadful than anything Twilight had the misfortune of smelling in her entire life. She’d personally concocted a potion designed to be the stinkiest thing in the entirety of Equestria, setting two records in the process… Fluttershy’s ass could have broken both of those records, and many more.

“Um… excuse me…” Fluttershy giggled, wriggling her plot on Twilight’s face and working the disgusting scent further into her. Twilight made a mental note to tell Gilda to take several showers once they returned to their original bodies.

Twilight was going to name a tier of foulness after Fluttershy, and it would definitely be the highest tier of anything Equestria had ever known before. The horrid stench of whatever indescribable horrors once occurred within Fluttershy’s stomach were so bad that Twilight instinctually attempted to use magic to cleanse the air around her… which would have worked, had she actually been able to use her magic.

Instead, she was forced to lie beneath Fluttershy and inhale every molecule of the pegasus’s toxic gas. It was only natural at this point she’d dread the next part, which she knew was coming; it was obvious to her that Fluttershy had altered her diet over the past few days just to ensure this moment was absolute hell for her. However, as expected, Twilight’s nethers didn’t quite agree with her mind, enjoying the situation for every little thing it was.

Fluttershy grunted again above Twilight, spraying out more fumes all over the poor gryphon’s face. A moist, crack-like sound followed the gaseous release, as Fluttershy moved the solid, snake-like matter through her bowels. In only a few seconds, it was visible to Twilight.

Sending a rather fast prayer to Celestia begging the substance to not be nearly as foul as Fluttershy’s gas, then proceeding to hate herself for possibly revealing to Celestia she’d gotten herself into this embarrassing situation intentionally (and was even enjoying it), Twilight slowly opened her mouth to catch the thin, smooth treat. Not to her surprise, Fluttershy’s scat was just as, if not more foul than the intestinal air she was breathing before. In fact, as Twilight felt the mass of waste in her mouth, she was so intently focused on the terrible flavour that she forgot to breathe at all.

Fluttershy’s tailhole twitched and contracted several times, before forcing another fresh and warm helping of disgustilicious manure into Twilight’s mouth; intense, conflicting flavors all burnt at her tastebuds as the shit rested on her tongue. Bitter, sour, sweet, foul, and overall cripplingly vile waste.

Twilight had a lot of trouble getting Fluttershy’s waste down, but eventually did pull it off. Chewing was a decision that cursed Twilight just as much as it aided her. It helped the waste slide down her throat faster and get the bulk of it out of her mouth, but the flavors released by chewing were far worse than she would have liked to deal with, plus much of it got stuck in her teeth. Not chewing didn’t release those flavors, but a lot of Fluttershy’s waste would stick to her throat as it slide down, where she’d feel it and taste it for hours more.

The pegasus’ shit, though potent, lacked volume. Only two servings later, less than a mouthful for Twilight, Fluttershy was done and let her tail fall back into its proper position. She hesitated before standing up.

“A-And um… you remember that…! I-I’ll be back in here t-to use you again…!”

A moment after Fluttershy got off the table, Twilight heard the door open to let a large amount of light through, then immediately close. She was alone again, with yet another unpleasant taste in her mouth. She could get used to it.

It wasn’t long after Fluttershy left that Twilight heard the door being messed with, as if somepony was desperately trying to get in but couldn’t. In fact, it sounded like somepony really, really needed to use a toilet, but their bathroom door just wasn’t cooperating. Something told her that wasn’t too far off from the truth.

A few more seconds of stumbling with the door knob, the door flew open then back shut. In a time that seemed faster than instantaneous, Twilight was beak-deep in her next tormentor. She would have wondered who it was, but it was unnecessary; the speed told her more than enough.

“Alright now, bitch,” Rainbow Dash practically growled above her, though Twilight quickly realized it only sounded that way because of how much she was straining to keep her asshole closed. “I’ve been holding this in - *Hnngh* - way past its due date… Hope you’re ready!” Twilight hoped so, too.

Easily smelling the mixture before it had even escaped Rainbow, Twilight could tell it was either going to be the high point or the low point of her stay as a toilet. On one hoof, she could love every second, and she could find herself sucking at the tasty cyan plot-pucker for another bitter drop. On the other hoof, however, she knew this could be the worst, worst, worst shit in the world. Every strain from Rainbow to fill Twilight’s mouth would result in yet more screams and more squirms, every grunt filling poor Twilight with dread - and, of course, bowel contents.

Faster than she can fly, Rainbow rushed a deluge of utterly disgusting waste downward into Twilight’s mouth. Runnier than any she’d had the displeasure of tasting thus far, Twilight let the brew rest in her for a second before making any full conclusion about how terrible this was going to be.

Her conclusion? This was going to be a nightmare.

Twilight swore she tasted small chunks of… something in Rainbow’s waste that was even worse than the liquid crap covering every tastebud she had, and, she thought, managing to actually be less bearable than the fluid feces was a feat that no taste should ever be able to claim. Indescribably painful waves of disgust put Twilight’s stomach in her throat and tears in her eyes.

Unlike most of the other waste she’d been fed, which was mostly bitter and/or sweet, like chocolate, the river of mud being dispensed into her mouth tasted… like nothing she could ever imagine. She wasn’t even sure how to describe what it tasted like. Not bitter, though bitter, not sour, yet completely sour - the taste of her own breath was enough to push her over the edge. Fluids from deep within Twilight rushed forth up her esophagus and out the other end, seeming to Twilight like they would rather be outside of her than attempt to digest such a wicked substance.

Too bad Rainbow Dash’s ass was in the way. The only relief Twilight got from throwing up was that her vomit tasted far more tolerable than Rainbow’s waste, even once the two were mixed together. She retched and spat it into Rainbow’s plothole, only to have it pressed back into her throat with another hot serving of death. Her relief was short-lived as every taste of vomit in her mouth was washed away, more quickly than it came.

The assault on Twilight’s mouth only stopped long enough for a long and sputtery, wet blast to fill her mouth and nose with the scent of everything rotten in the world. Being forced to inhale it was like being forced to suck year-old broken eggs out of a dead skunk’s ass, or probably worse. Twilight was so distracted by the brutality occurring on her tongue that she didn’t even notice she, at some point, started involuntarily sobbing.

Vomiting again did not give the same results as before, because vomit could not save her senses from the scent and taste of Rainbow Dash’s flatulence. And, without fail, a lot more came.

An onslaught of more shit pressed out with more gas pressed out with more shit pressed out with more gas… Twilight wasn’t sure how any living creature could contain this and remain alive, nor did she know what in the living hell Rainbow could have possibly eaten to cause this kind of violent reaction in her stomach. All she knew was that, for one of the first times since she’d been imprisoned and forced to be the slave of everypony’s asshole, she actually wanted it all to stop. She wanted free. She wanted to get out of her position.

It was far, far too late for that wish to become reality.

Rainbow Dash cried out above her, jolting her out of her self pity to look up at her friend. To add insult to injury (and a lot of already potent insult), Rainbow was rubbing herself between her legs as she squatted on Twilight’s face. No doubt, just another fluid that was intended for stuffing down Twilight’s throat.

Another mouthful of runny disaster splashed into her mouth with a disturbing sludge-sound. By now, Twilight had stopped swallowing, letting it splash all over her face and dye her head a new color. She had to keep her eyes tightly shut, otherwise blindness would have been certain. Her nose burned as her nostrils kept a recurring, fresh coat of excrement.

She was content with her sickening facial, though the scent of waste directly blocking her nose was sensually catastrophic, she couldn’t hope for any better - the only alternative was swallowing the liquid toxic being distributed to her.

Then Rainbow repositioned herself, planting her anus directly against Twilight’s mouth. As she squeezed, Twilight lost the ability to choose - excess drops of it sprayed off in other directions, but the bulk of Rainbow’s shit was shot into her mouth.

“Don’t think… you can get off that easy…!” Rainbow was close. The excitement and kinkiness of effectively vaporizing her ex-friends’ senses of taste and smell with the matter inside of her plot was plenty enough for her to get off to. A cry-moan of pleasure exploded from Rainbow, as well as a powerful blast of shit and just as much gas, filling Twilight’s mouth so much her cheeks hurt from attempting to keep it all contained.

The sweet, no-doubt-far-better-than-the-terrors-within-Twilight’s-mouth fluid silently squirted all over her face and neck, its sweet and spicy scent completely masked by that of Rainbow’s other expulsions. Twilight tasted as much of it as she could, allowing it to create an excellent sauce for her vile dinner.

Rainbow was panting above her, the after-effects of her orgasm apparent within her blissful, flaming expression. As if in estrus, she’d sharply raised her flank as she came, leading Twilight to wonder if that was due to her pleasure or just because she wanted to cover her face in it. Rainbow remained in this position for several minutes longer.

Once her consciousness had fully returned, Rainbow shot Twilight a glance. “Gotta piss too, keep it wide open for me, okay?”

The dominance in her tone seemed to have leaked out, causing her to sound much more casual as she calmly used Twilight’s mouth for relief. Unsurprisingly, Rainbow’s urine was nowhere near as bad as her scat, though it was still at least in her top twenty of most foul things in the world. Flutterfarts were number one.

The room went silent aside from the ever-so-satisfying sound of stream-in-mouth. There was no trouble in drinking every drop Rainbow gave Twilight, and she even went so far as using her piss to clean her mouth of the previous droppings. She quickly found herself aroused with Rainbow’s fit body above her, tail lifted, marehood directly in front of her beak… she’d fantasized the moment in the past, though in slightly different context.

“Wait, are you getting turned on by this?”

Twilight froze as Rainbow stared at the wettening slit between her legs. Silence followed, awkward for Twilight, confused for Rainbow- who, at that same moment, felt her well run dry.

And then, realizing exactly what the arousal meant, Rainbow burst into laughter, practically falling over and slamming her flank on Twilight’s face in the process. Not that she would have minded.

“Y-You…! Y-You’re turned on by this!?” Her laughter intensified. “I just took a dump in your mouth, made you drink my piss, a-and you…” Laughing reduced itself to a few giggles and snickers. Rainbow shook her flank above Twilight’s face. “Maybe we should make this permanent… looks like we both like it!”

Twilight was too humiliated to give any kind of answer or response as Rainbow got off of her and walk out of the room, giggling some more as she walked. It was only a day until she was going to be let free, and then she’d have all she needed to end the experiment and hopefully conduct it again with some ponies with non-toxic asses.

---

The next day came and Twilight was ready to get out. The door opened, causing her to think for a moment that she was going to be used again, but she was quickly relieved to see her own body standing before her. “Hey.”

Twilight sighed, lying her head back and relaxing. “Hey… time for me to be let free, right?” Her furs individually raised as she heard Gilda snicker.

“Free? Not quite!” Gilda hopped onto the table and turned around, letting Twilight take a good look at her own plot for the second time in a week. “I got the others together, and we all agreed since you loved how Dash treated you yesterday, to keep you in here another two weeks! Isn’t that great?”

“W-Wha-” Twilight was interrupted by her very own flank being pushed down on her muzzle.

“Of course, since we all agreed, who am I to go against it? If you did get let go today, I’d have your friends after me! And who wants that?”

Muffled protests were all Twilight could manage before a roaring gust of air forced her into silent submission.

“Looks like your fun is just getting started, Gilda!”